http2: fix all vet warnings

Updates golang/go#16228
Updates golang/go#11041

Change-Id: I2b50c2f4bfaae2d9ad59bc78e1c7c3e807f08075
Reviewed-on: https://go-review.googlesource.com/28344
Run-TryBot: Brad Fitzpatrick <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
6 files changed
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